First time installing Tankless Boiler + Tankless Water Heater?

Me and my dad both install boilers for a living but tomorrow we are doing our first Tankless/Condensing Boiler (1 zone) and Tankless Water Heater mounted on a piece of wood. We are not sure what to use to mount the pipes and the boiler and water heater onto the wall. Also someone had mentioned to us something about a closed loop system. Does this concern a 1-zone system? All tips and help appreciated.

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